A warning light is your car telling you something has changed. Some lights mean "stop now", others mean "book a check this week". Knowing the difference protects your engine, your safety and your wallet.
Start with the colour
- Red: a serious problem or a safety risk. Stop as soon as it is safe and check before driving on.
- Amber or yellow: something needs attention soon. You can usually drive carefully to a workshop.
- Green or blue: information only, such as headlights or cruise control being on.
A light that flashes is normally more urgent than the same light shown steadily.
Red lights: stop and check
Oil pressure (oil can)
The engine has lost oil pressure. Driving on can destroy the engine within minutes. Stop, switch off and check the oil level once the engine has rested. If the level is fine and the light stays on, do not drive the car; arrange recovery.
Engine temperature (thermometer in liquid)
The engine is overheating. Switch off the AC, turn the heater to full, stop safely and turn the engine off. Never open a hot radiator cap. Our overheating guide explains what to do next.
Battery / charging
The battery is not being charged, usually because of the alternator or its belt. The car will run on battery power only and may stop soon. Switch off non-essential electrics and head straight to a workshop.
Brake warning (circle with "!" or "BRAKE")
First check that the parking brake is fully released. If it is, the brake fluid may be low or there may be a fault in the system. Brakes are not something to gamble with: have it checked before driving further.
Airbag / SRS
An airbag or seat-belt pretensioner fault. The car drives normally, but the airbags may not deploy in a crash. Book a diagnosis soon.
Amber lights: book a check
Check engine (engine outline)
Steady: the engine computer has logged a fault: anything from a loose fuel cap to a sensor, misfire or emissions issue. Book a diagnosis. Flashing: the engine is misfiring badly. Reduce speed and stop driving as soon as you can, because unburnt fuel can overheat and damage the catalytic converter.
ABS
The anti-lock system is off. Normal braking still works, but wheels can lock in an emergency stop. Usually a wheel-speed sensor or wiring.
Traction or stability control (car with wavy lines)
Flashing briefly while accelerating on a slippery surface is normal: the system is working. If it stays on, the system has a fault or has been switched off.
Tyre pressure (horseshoe with "!")
One or more tyres is under-inflated. Check all four with a gauge when cold. In Dubai heat a soft tyre overheats quickly, so don't ignore it.
Power steering (steering wheel with "!")
The electric power steering has a fault. Steering may become heavy. Drive carefully and have it diagnosed.
Gearbox / transmission
Often shown with a gear symbol or thermometer. The gearbox may be overheating or in limp mode, with limited gears. Avoid hard driving and get it checked.
Diesel particulate filter and glow plug (diesels)
A DPF light means the filter needs a longer drive at steady speed to clean itself, or it is blocked. A flashing glow-plug light often signals an engine fault rather than a glow-plug issue.
Service reminders and German-car messages
A spanner or "Service due" message is a reminder, not a fault. Mercedes shows Service A or B through its ASSYST system, and BMW lists individual items under Condition Based Service. German cars also show text messages such as "Visit workshop" for AIRMATIC suspension or "Drivetrain malfunction": these always deserve a full-system scan, because the message alone rarely tells you the cause.
What to do when a light comes on
- Note the colour and whether it flashes.
- Notice how the car behaves: noises, smells, loss of power, temperature.
- Check the simple things: parking brake, fuel cap, oil and coolant levels (engine cold), tyre pressures.
- Take a photo of the dashboard. It helps the technician, especially for intermittent faults.
- Don't just clear the code. Clearing it turns the light off but leaves the fault; it usually returns.
Why a full diagnosis beats a quick code read
A basic code reader only reads the engine module and gives a generic code. Modern cars, especially German ones, have dozens of modules. A full-system scan with live data shows the real cause, so you replace the right part the first time. At Partinn Auto Service a full computer diagnostic check is free with any major service. More about car diagnostics.
Need a hand with your car?
Partinn Auto Service is an independent workshop in Dubai Investment Park 2 (DIP 2). Send a photo of the warning light and your car model on WhatsApp 052 296 5483 or call 058 821 2219. Open Monday to Saturday, 9 AM to 10 PM.
